If Kris Letang chooses to test free agency, the name being floated in Pittsburgh media to replace him is current Edmonton Oilers defenseman, Tyson Barrie.
Barrie is currently on the trade block, according to Jeff Marek and Elliotte Friedman, and the Oilers, are looking to move salary to create cap space. Barrie is ready for more responsibility on a new team if he doesn't contribute to Edmonton in multiple ways including the Power-Play.
Barrie can quarterback a power play, skate, and contribute offensively, as in the last two seasons, in 56 games he put up 8g and 40 assists for 48 points, and this year 41 points in 73 games, all the while putting up 37 power-play points.